Foundation pit supporting and foundation treatment synergistic effect method and structure and underground structure construction method

Abstract

The invention provides a foundation pit supporting and foundation treatment synergistic effect method and structure. The foundation pit supporting and foundation treatment synergistic effect method and structure are used for reinforcing a construction area before foundation pit excavation is conducted in an upper-hard and lower-soft composite stratum. The method comprises the following steps thatthe side boundary of a foundation pit is determined in the construction area, and a dewatering tube well is arranged; precast piles is constructed in the passive area of the foundation pit to reinforce the bottom of the foundation pit; a waterproof curtain is arranged, flexible piles are constructed in the passive area of the foundation pit to reinforce the bottom of the foundation pit, foundationpit edge reinforcing bodies are constructed along the inner side of the side boundary of the foundation pit, and foundation pit inner reinforcing bodies are constructed every other preset distance inthe longitudinal direction of the foundation pit, the foundation pit internal reinforcing bodies transversely extend along the foundation pit and are connected to the foundation pit edge reinforcingbodies which longitudinally extend along the foundation pit on the two sides of the foundation pit; and the fender posts are constructed by fitting the outer side of the foundation pit edge reinforcing bodies and along the side boundary of the foundation pit. By the adoption of the synergistic effect method and structure, the technical problem that in the prior art, construction machinery has to work on a substrate soft stratum, and consequently construction is difficult can be solved.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a foundation pit support and foundation treatment synergistic method, structure and underground structure construction method in an upper-hard-lower-soft composite stratum. Background technique [0002] Among the many factors in the construction environment of underground structures, the characteristics of basic geology and engineering geology are particularly important for the selection of construction technology, especially for engineering construction in complex strata. Composite stratum refers to the composition of two or more different strata within the scope of excavation section of underground engineering and in the direction of excavation extension. There are many types of composite strata. In this paper, composite strata specifically refer to the combination of different strata in the vertical direction of the end surface. The upper hard and lower soft composite s...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a synergistic method, structure, and underground structure construction method for foundation pit support and foundation treatment, so as to solve the technical problem in the prior art that construction machines have to work on weak bases, resulting in difficult or even impossible construction

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